2016-09-14, Version 6.6.0 (Current)

Notable changes:

* crypto: Added `crypto.timingSafeEqual()`. (not-an-aardvark)
https://github.com/nodejs/node/pull/8304
* events: Made the "max event listeners" memory leak warning more
accessible. (Anna Henningsen) https://github.com/nodejs/node/pull/8298
* promises: Unhandled rejections now emit a process warning after the
first tick. (Benjamin Gruenbaum)
https://github.com/nodejs/node/pull/8223
* repl: Added auto alignment for `.editor` mode. (Prince J Wesley)
https://github.com/nodejs/node/pull/8241
* util: Some functionality has been added to `util.inspect()`:
- Returning `this` from a custom inspect function now works. (Anna
Henningsen) https://github.com/nodejs/node/pull/8174
- Added support for Symbol-based custom inspection methods. (Anna
Henningsen) https://github.com/nodejs/node/pull/8174

Refs: https://github.com/nodejs/node/issues/8428
Refs: https://github.com/nodejs/node/pull/8457
PR-URL: https://github.com/nodejs/node/pull/8466